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September Weather in South Beloit, United States

Last updated: June 24, 2025

In September, the average temperature in South Beloit, United States is a pleasant 19°C (66°F). However, expect some variation, with temperatures ranging from a cool 2°C (36°F) to a warm 33°C (92°F). Be prepared for 108 mm (4.3 in) of precipitation across approximately 9 days, contributing to a relatively high average humidity of 79%.

September Temperature in South Beloit

In September in South Beloit, the average temperature is 19°C (66°F). The maximum can reach 33°C (92°F) and the minimum can be as low as 2°C (36°F). This diverse climate makes South Beloit an ideal destination for travelers looking to experience a range of temperatures and activities.

September Weather in South Beloit: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in South Beloit, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Beloit, September typically has an average temperature of 19°C (66°F), with highs reaching up to 33°C (92°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec222437476071757266523731
Data source: Temperature data for South Beloit generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in South Beloit

In South Beloit in September, the precipitation amount is 108 mm (4.3 in) spread over 9 days.

September Precipitation Trends in South Beloit

The chart displays monthly precipitation patterns in South Beloit, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In South Beloit, September typically receives around 108 mm (4.3 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec60546310314210773871081094752
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in South Beloit

In South Beloit in September humidity is 79%. With an average temperature of 19°C (66°F), this humidity feels like a warm embrace, making it feel much warmer than the actual temperature and creating a heavy, sticky atmosphere that can be a bit uncomfortable for traveling.

September Average Humidity in South Beloit

This chart illustrates the average monthly humidity levels in South Beloit, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in South Beloit is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in South Beloit

In South Beloit in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in South Beloit.

Maximum UV Index Levels in South Beloit for September

The chart shows the monthly maximum UV Index (UVI) for South Beloit in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in South Beloit typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098532
Data source: South Beloit September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in South Beloit Compares to Other Months

Weather in South Beloit varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in South Beloit, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in South Beloit, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)60 mm (2.3 inches)85%moderate
February Weather-4°C (25°F)54 mm (2.1 inches)85%moderate
March Weather3°C (38°F)63 mm (2.5 inches)85%high
April Weather8°C (47°F)103 mm (4.1 inches)85%very high
May Weather16°C (60°F)142 mm (5.6 inches)78%very high
June Weather22°C (71°F)107 mm (4.2 inches)80%very high
July Weather24°C (75°F)73 mm (2.9 inches)78%very high
August Weather22°C (72°F)87 mm (3.4 inches)76%very high
September Weather19°C (66°F)108 mm (4.3 inches)79%very high
October Weather11°C (53°F)109 mm (4.3 inches)83%moderate
November Weather3°C (37°F)47 mm (1.8 inches)88%moderate
December Weather-1°C (31°F)52 mm (2.0 inches)81%low

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